This question already has an answer here:
I am using QGIS2.4.0 on a Windows computer. When I export a map containing OSM landscape, the labels in the output map are smaller then in the view in the composer. (even if the view in the composer is at zoom 100%)
This is not the only difference, here an example (click to magnify images):
The view in the composer
The exported file
You can see that the labels are now impossible to read.
I want to be able to print and export the view as I see it in the composer.
I tried the solutions for the question How to improve OSM layer resolution in OpenLayers plugin while exporting? but that didn't help.
So the problem is not the openlayers plugin.